Mold processing is characterized by a single piece of small batch size and complex geometry, so the processing cycle is long and the production efficiency is low. In the traditional mold processing process, the finishing hardened mold usually adopts the electric discharge machining and the manual polishing process, and the post-processing takes a lot of time. Shortening processing time and reducing production costs are the main goals of developing mold processing technology. In recent years, there have been many new technologies in the mold processing technology, such as high-speed cutting, CAD/CAE design simulation, rapid prototyping, EDM milling and composite machining. Among them, the most eye-catching and best-performing is high speed. Cutting processing. The high-speed machining mold uses the high-speed and high-feed speed of the machine tool to complete multiple production steps of the mold in a cutting manner. The superiority of high-speed machining molds is mainly reflected in the following aspects: 1 High-speed cutting roughing and semi-finishing, greatly improving the metal removal rate. 2 High-speed cutting machine tools, tools and processes can be used to process hardened materials. For small molds, after heat treatment of materials, coarse and fine processing can be completed in one setup; for large molds, roughing and semi-finishing before heat treatment, and hardening and finishing after heat treatment. 3 high-speed high-precision hard cutting instead of finishing, reducing a lot of time-consuming manual grinding, improving efficiency by 50% than EDM. 4 Hard cutting process the final forming surface to improve surface quality and shape accuracy (not only low surface roughness, but also high surface brightness), which is more advantageous for mold processing of complex curved surfaces. 5 Avoid the decarburization, burn and micro-crack phenomenon caused by electric spark and grinding, greatly reduce the surface damage after the mold finishing, and improve the mold life by 20%. 6 The workpiece has less heat, less cutting force and less thermal deformation. It is combined with CAD/CAM technology for fast machining of electrodes, especially for electrodes with complex shapes and thin walls. The advantage of high-speed cutting is self-evident for mold processing, but at the same time, the high-speed cutting cost of the mold is high, the use of the tool is high, and complicated computer programming technology is required for support and equipment operation cost. High, therefore, due to capital, technology and other reasons, the domestic application of high-speed cutting molds is still not much. At present, there is a need to solve the problem of how to select and apply high-speed machining molds, high-speed cutting tools, reasonable machining processes, tool paths. A series of problems such as programming layers and process experiments. High-speed cutting machine for machining molds Pay attention to the following issues when selecting a high-speed machine for high-speed cutting dies: (1) The machine tool spindle is required to have high power and high speed to meet rough and fine machining. The precision machining tool requires a small-diameter tool with a spindle speed of 15,000 to 20,000 rpm. Machines with spindle speeds below 10,000 rpm can be roughed and semi-finished. If it is necessary to satisfy both roughing and finishing in the production of large molds, the selected machine tool preferably has two spindles of two speeds or two types of electric spindles. (2) The fast feed of the machine tool is not too fast for fast air travel. However, it has a relatively high processing feed rate (30 to 60 m/min) and high acceleration and deceleration. (3) It has a good high-speed, high-precision control system, and has functions such as high-precision interpolation, contour look-ahead control, high acceleration, and high-precision position control. (4) Select CAD/CAM software for high-speed machine tools, especially for high-speed cutting molds. In the production of molds, the application of five-axis machine tools is gradually increasing. The high-speed cutting molds have the following advantages: 1 can change the cutting angle of the tool, good cutting conditions, reduce tool wear, help protect the tool and extend the life of the tool; 2 flexible processing route Reduce tool interference, can process molds with complex surface shapes and deep cavity molds; 3 large processing range, suitable for many types of mold processing. Five-axis machines are usually available in both work bench and mill head five-axis machines and can be selected for mold types. In the milling head type five-axis machine tool, the five-axis machine tool that can replace the milling head and replace the electric spindle head can be used for roughing and finishing of the mold respectively. Tool technology for high speed cutting dies High-speed machining requires a suitable tool. The application of cemented carbide coated tools and polycrystalline reinforced ceramic tools makes it possible to combine high-hardness blades and high-toughness substrates, which promotes the development of high-speed machining. The hardness of polycrystalline cubic boron nitride (PCBN) inserts can reach 3500~4500HV, and the hardness of polycrystalline diamond (PCD) can reach 6000~10000HV. In recent years, Germany's SCS, Japan's Mitsubishi (Kobelco) and Sumitomo, Switzerland's Sandvik, the United States Kenner Feishuo and other famous foreign tool companies have launched their own high-speed cutting tools, not only high-speed cutting of ordinary structural steel tools, but also Superhard tools such as ceramic tools for direct high-speed cutting of hardened steel, especially coated tools, play a huge role in the semi-finishing and finishing of hardened steel. At present, the development of high-speed machining tools in China is still far from the foreign countries, and the expensive price of imported tools has become an important factor hindering the application of high-speed cutting tools. In general, when the acceleration of the tool and the tool holder is required to be more than 3g, the radial runout of the tool is less than 0.015mm, and the length of the tool is not more than 4 times the diameter of the tool. According to SANDVIK's actual statistics, when using a titanium carbide titanium nitride (TiCN) coated solid carbide end mill (58HRC) for high-speed milling, the roughing tool line speed is about 100m / min, while finishing and super At the time of finishing, the line speed exceeded 280 m/min. According to the experience of domestic high-speed finishing molds, when the small-diameter ball-end milling cutter is used for mold finishing, the line speed exceeds 400m/min. This has high requirements for tool materials (including hardness, toughness, red hardness), tool shape (including chip removal performance, surface accuracy, dynamic balance, etc.) and tool life. Therefore, in the high-speed hard cutting and finishing of the mold, not only must the high-speed machine tool be selected, but also the tool and cutting process must be properly selected. When processing molds at high speed, it is important to pay attention to the following aspects: 1. According to different processing objects, reasonable selection of carbide coated tools, CBN and diamond sintered layer tools. 2 The surface of the mold is finished by a small-diameter ball-end milling cutter, usually with a diameter of <10 mm. The selected tool diameter is also different depending on the material to be processed and the hardness. In terms of tool material selection, TiAIN ultra-fine grained carbide coated tools have good lubrication conditions and have better wear resistance than TiCN carbide coated tools when cutting die steel. 3 Select the appropriate tool parameters, such as negative rake angle. High-speed machining tools require higher impact toughness and thermal shock resistance than ordinary machining. 4 Take a variety of methods to improve tool life, such as the appropriate feed, feed method, lubrication method, etc., to reduce tool costs. 5 uses a high speed tool holder. At present, the most widely used HSK tool holders and hot-pressing clamping tools should also pay attention to the overall dynamic balance of the spindle system after tool clamping. Process technology for high speed cutting die In high-speed machining mold technology, process technology is a key factor in the use of machine tools and tools. According to the current situation of domestic mold production, the process technology has largely restricted the application of high-speed machining molds. On the one hand, due to the short time of high-speed machining application, it has not formed a relatively mature and systematic process system and standard; on the other hand, the high-speed cutting process has high test cost and requires large investment and long time. Eye Liner Bottle,Plastic Eyeliner Bottle,Eye Liner Tube Anda Aluminum Co., Ltd. , http://www.chinacosmeticbeauty.com